Stop mechanism for metal-working machines.



J. HARTNBSS.

STOP MECHANISM FOR METAL WORKING MACHINES APPLICATION FILED SEPT. '7,1911.

Patntd Aug. 20,1912.

3 SHEETS-SHEET 1.

, J. HARTNESS. STOP-MECHANISM FOR METAL WORKING MACHINES.

nil H .APPLIUATION FILED SEPT. 7, 1911.

m 8 mm w a Qm t m n m m H i i i m I, n u m a P u APPLICATION FILED SEPT.7, 1911.

Patented Aug. 20, 1912.

3 SHEETS-SHEET 3.

. stop mechanisms for determining the extent of travel of one of .themovable carriages of UNITED STATES PATENT OFFICE.

'QJAMEVS'HA'RTNES'S, or SPRINGFIELD, VERMONT.

STOP MECHANISM FOR METAL-WORKING MACHINES.

Specification of Letters Patent.

Patented Aug. 20, 1912.

Application filed September 7, 1911. Serial No. 648,167,

To all whom it may concern:

Be it known that I, JAMES HARTNESS, a

citizen of the United States, and resident of Springfield, in the countyof Windsor and.

the machine. In. machines such as illustrated in my previous Patent No.792,591, dated June 20, 1905,

her 4, 1904 the ,extent of movement of the carriage is determined by aseries of stop bars mounted upon the bed, with which may be engagedcooperating stops on a movable carriage. The carriage maybe either thetool carriage which reciprocates longitudinally on carriage whichsupports the work.

with the stop bars located on the bed.

For economy of space it is desirable that g the stop bars'on the bedshould be located close together and yet in an accessible position-where they may be easily adjusted lengthwise by the operator inaccordance lathe is indicated at 20, and the carriage at 21. Thecarriage is mounted to move transwith the character of the out beingmade upon. the work.

a plurality of groups of socket members each of which is adapted toreceive a stop member so that the member may be located to engage anyone of the stop bars on the 'bed and limit the movement of the carriage.Preferably each of the socket members is adjustable longitudinally withrespect to its corresponding stop bar on the bed, and by arranging thesocket members in groups I am able to provide a clamp for clamping intheir adjusted positions all of the socket members of each the same,taken inthe vertical plane of the feed screw. Fig. 3 represents a planview of the end portion of -the bed with the head or 771,242, datedOctothe bed, ora cross-sliding head or In some cases both the toolcarriage and the work carv riage are provided with stops for coacting-In accordance with the 1 present lnvention I provlde a carriage with orcarriage removed. Fig. fl (Sheet 1) shows in plan View the stop bars onthe bed and the socket members on the carriage. Fig. 5 represents asection on the line 5-5 of Fig. 4. Figs. 6 and 7 (Sheet 2) illustrateside and plan views of one of the stop bars. Figs. 8 and 9 representsimilar views of one of the spacers. Fig. 10 represents an enlargedsection through the stop mechanism on the same plane as that on whichFig. 2 is a section. Fig. 11 represents a section on the line 11 11 ofFig. 10. Figs. 12, 13 and 14 illustrate in detail a stop bar, one of thesocket members, and the stop pin which is inserted through the socketmember. Fig.

15 shows perspectively one of the socket members and the stop pin. Figs.1*6 and 17 illustrate one of the clamps for'a group of socket members,Fig. 17 being a section on line 17-17 of Fig. 16. Fig. 18 illustratesthe spreading bolt for spreading the screw ofthe bolt. v

The same reference characters indicate the same or similar partswherever they occur.

I have illustrated the invention as being utillzed 1n connection withthe cross-sliding head or work carriage, but it will be understood thatit is-equally applicable to the tool carriage.

Referring to the drawings: The bedxof the versely of the bed upon tracksor guides provlded at-the end of the bed as described in my co-pendingapplication, Serial No. 647,873, filed concurrently herewith. The

carriage is provided with one or more work spindles to which power maybe applied by any convenient'mechanism. The lathe is further equippedwith a tool slide which ismovable longitudinally of the bed, as illus-.trated in either of the patents to which I have hereinbefore referred.The work carriage is moved transversely of the bed by hand or by powerthrough the medium of a feed screw 22.

Immediately below the head the bed is formed with a table 23 having arelatively wide shallow groove 24 for the reception of stop bars whichmay be arranged there 1 in in parallelism. These stop bars are indicatedat 25, 25 25 26, 26 26 27 27 27"; but their number may be increased ordiminished as desired. Each stop bar consists of a metallic striprectangular in cross section, and in its top and bottom it is providedwith notches a, b, as shown in Fig. 6, so that the stop bar may bereversed to bring either of the notches "uppermost, in consequence ofwhich each stop bar may be adjusted to bring a notch in any one of agreat. variety of positions.- The said stop bars are separated byspacers'28 which consist of narrow metallic strips alternating with thestop bars, as shownin Figs. 3 and '5. The stop bars and spacers are allbound frictionally together by set screws 29 .passed through the side ofthe table so as to,e-ngage theouter stop bar of the series and laterallycompress the stop bars and spacers. By releasing the set screws 29 thestop bars may be adjusted,-turned upside down, or reversed end for end,so as to locate either one of the notches on the bar in any position tostop the movement of the carriage at any point that maybe desired. Ifind it desirable to lock the spacers to the bed to prevent their movingendwise when the stop bars are adjusted longitudinally, and to this endthe under side of each spacer is pro videdwith a tongue or projection 28which extends downward into a groove 24 formed in the table andextending transversely of the series of stopbars and spacers (see Fig.2). Byireason of this'construction, while the spacer bars are heldagainst longitu- 'dinal movement, they are free to be moved Thecarriage, on its front side, is formed laterall: when the binding screws29 are forced 'nwardly to frictionally bind the spacersand stop barstogether.

with a substantially horizontal web orflange 30 which'islocated abovethe table 23 but I in closeproximity thereto, as illustrated in Figs. 1,2'and-10. 'This web or flange constitutes a'support for the socketmembers. These socket members are illustrated as being arranged ingroups of three, as indicated at 31, 31 31 32, 32 32 33, 33 33 so thatthey registenwith the corresponding stop-bars25, 25 251 26, 26 2 27, 2727 as best shown in Fig. 4. Each socket may consist of a bushing whichis inserted 1n a cylindrical aperture in the support 30 and is providedat itsupper end with a peripheralflange 34 which will overlap and restupon the top of the support to prevent the bushing'fro'm droppingthrough the aperture therein. Each bushing. has an eccentric bfore oraperture 35. These bush.

- ings are arranged in the apertures in the support so that the bore ofeach' one is -im-...

mediately above and in. registration with its corresponding stop bar,and each bushing is sov located that by slightly rotating it in onedirection or the other its bore 35 will be adjusted to a slightextentlongitudinally of the stop bar.

The socket members or bushings-of each group are simultaneously clampedagainst rotation by a clamp consisting of a split or segmental ring 36having the. segments 36*, 36, 36. The ring as a whole is formed witha-beveled:bore'36 through which may be inserted a spreading screw 37having its lower enlarged threadedend- 37 screwed into a threadedaperture in the support 31.

This screw has aperipherally beveled col-,

lar or flange 37 which will engage the bev-,;

eled portions of the segments of the ringj and spread them radially intoengagementwith the bushings. Each one of the seg ments has a concavity36 in its peripheral portion toengage the periphery of the adjacentbushing. The spreading screw. has an angular head 37 which maybe-engaged by a socket wrench to rotate it and release orbind thesegments of thering 36.

Into each of the socket members may be i inserted a-stop member whichconsists of-a pin 38 having a reduced end 38 which will project belowthe lower end ofthe bushing and ride upon the top of the correspondingstop bar so as to drop into the notch a or b of such stop bar and limitthe movement of the carriage by engaging one of the shoul-.

ders at the end of thenotch. The stop pin is provided with a lateralprojection or finger 38 which may rest upon the shoulder formed by theupper end of the socket member so as to hold the end- 38 of the. pin ininactive position in a horizontal plane above the upper surface of thestop bar. Each of Y the socket members, however, is provided with aninternal slot 39 to receive the finger or, projection 38 and permit thepin 38 to drop into active position. The'stop pin is provided with alateral handle 38 whichaffords a convenient means for the operator toremove the stop pin from one bushing and insert it in another, or torotate it to bring the finger or projection 38 into reg istration withthe slot 39 in the bushing, and to rotatively adjust said bushing.

From the foregoing description it will be seen that the stop bars andspacers may be narrow so as to occupy a contracted space on the bed, andthat by grouping the socket The rotative adjustability of the socketmembers provides for'a nice-adjustment of the stop pin relatively to thestop bar with which it is to engage, so that the operator may'adjust thestop bar to approximate position, and then secure an accurate operationby adjusting the stop pin and bushing.

It will be noticed that in. this particular embodiment of the inventionthe stop mechanism is located above the feed screw near one of the waysor rails on which the carriage is movable.

Having thus explained the nature of my said invention and described away of consaid stops.

2. In a lathe the combination with a bed and a series of stops thereon,of a carriage movable .on said bed, a plurality f rotatively adjustableeccentric socket members thereon, and a stop pin insertible in any one'of'said socket members.

3. In a lathe, the combination with a bed and a carriage, of a series ofstops on one of said instrumentalities, a like number of socket membersarranged about a center in a group on the other of saidinstrumentalities, and a removable stop insertible in any one of saidsocket members for engagement with-the corresponding stop of the saidfirst mentioned series.

4; In a lathe, the combination with a bed and acarriage, of a series ofstops on one of said instrumentalities, a like number of socket membersarranged about a center in a group on the other of saidinstrumentalities, a clamp common to all of said socket members, and aremovable stop pin insertible in any one of said-socket members.

5. In a lathe the combination with a bed and a series of parallel stopbars thereon, of a carriage movable on said bed'longitudinally of saidbars, groups of socket members on said carriage, each group consistingof member's arranged around a center, and each member registering withone of the stop bars, and means adapted for insertion in said members toengage'said stop bars.

6. In a lathe the combination with a bed and a series of parallel stopbars thereon, of a carriage movable on..said bed longitudinally of saidstop bars, groups of socket members on said carriage, each groupconsisting of members arranged around a center, and each memberregisteringwith one of the stop bars, a clamp for the members of eachgroup, and means adapted for insertion in said members for engagementwith said stop bars.

7 In a lathe the combination with a bed and a series of parallel stopbars thereon, of a carriage movable on said bed longitudinally of saidstop bars, groups of socket members on said carriage, each groupconsisting of a plurality of rotatably adjustable eccentric bushings,and each bushing registering with one of said stop bars, a clamp for-thebushings of each group, and means adapted for insertion in said membersfor. engagement with the stop bars.

8. In a lathe the vcombination with a bed and a-series of parallel stopbars thereon, of

a carriage movable on said bed longitudinally of said stop bars, groupsof socket members on said carriage,'each group consisting of a pluralityof rotatably adjustable eccentric bushings, and each bushing registeringwith one of said, step bars, a clamp for the bushings of each group, anda pin adapted for insertion in any one of said bushings for engagementsponding stop bar.

9. In a lathe, a bed having a group ofindependently adjustable stops, acarriage movable on said bed and having a group of socket memberscorresponding to said stops,

with y the corresaid group consisting of rotatably adjustable eccentricbushings, a stop pin for insertion in any one of said bushingsforeligagement with its corresponding stop, and a clamp for said group ofsocket members comprising a sectional ring and spreading screw forspreading the sections of said ring into engagement with said bushings.

10. In a lathe, a bed having a stop, a carriage having a cylindricalaperture, an eccentric bushing located in said aperture and rotativelyadjustable therein, said bushing having a shoulder and a slot, and astop pin insertible in said bushing and having a lateral projection torest on said shoulder or to extend into said slot, substantially assetforth.

11. The combination of a sliding carriage having a stop, a bed, a seriesof parallel longitudinally adjustable stop bars located on said bed, aseries of spacers on said bed alternating with said stop bars, saidspacers and said bed having a complemental transverse tongue and grooveconnection. and means for laterally binding said spacers and stop barsin frictional engagement.

12. The combination of a sliding carriage having a stop, a bed, a seriesof parallel longitudinally adjustable stop bars located on said bed, aseries of spacers on said bed alternating with said stop bars, means forlaterally binding said stop' bars and spacers in frictional engagement,and means for securing said spacers to said bed to hold them againstlongitudinal movement without interfering when said stop bars arelongitudinally adjusted.

13. In a lathe the combination with a bed and a carriage, of a pluralityof parallel independently adjustable stop bars arranged in Lthe sameplane on one of said instrumen- In testimony whereof I- ha e a-ifixed mytahties, a stop member on the other of said signature, in presence oftwo witnesses. instrumentalities, said last-mentioned -in--strumentality having a series of sockets for JAMES HARTNESS' thereception of said stop member, and VVitnesses: means for adjusting saidstop member there- G. W. CLACE,

on longitudinally of said stop bars. W. WALKEB

